Segment Reporting - Financial Information by Business Segment (Assets) (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 68,539	$ 73,679
Operating Segments | Marine Technology Products
Segment Reporting Information [Line Items]
Total Assets	46,331	35,879
Operating Segments | Equipment Leasing
Segment Reporting Information [Line Items]
Total Assets	22,231	37,850
Eliminations
Segment Reporting Information [Line Items]
Total Assets	$ (23)	$ (50)